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J Chin Soc Corr Pro  2003, Vol. 23 Issue (5): 286-289     DOI:
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THE NEW TECHNOLOGY OF THE ANODIC OXIDATION APPLIED TO AZ91D ALLOY
Henan Wang;Hongwei Huo;Ying Li
中科院金属所
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Abstract  A suitable mixture without chromium is developed for protection of mag nesium alloys by treatment with the anodic oxidation.The aqueous solution is co mposed of NaOH、Na2SiF6 and an organic additive.The potentiodynamic polariza tio n measurement showed that the film had outstanding protective ability in 3.5% Na Cl solution.The morphology and component of the anodic oxidation film have been analysed by SEM,XRD,XPS and EPMA respectively.XRD and EPMA analysis revealed that the film was made of MgO、MgAl2O4 and 2Al2O3·2SiO2·H2O.Si and Al oxides make up the volume shrinkage of magnesium oxides,so that the film has no crack which provides a good condition against pitting.And the even dispersio ns of Si and Al in the film is another factor that the film has better protectio n.
Key words:  magnesium alloy      anodic oxidation treatment      corrosion resistance      
Received:  17 May 2002     
ZTFLH:  TG174.1  
Corresponding Authors:  Henan Wang   

Cite this article: 

Henan Wang; Hongwei Huo; Ying Li. THE NEW TECHNOLOGY OF THE ANODIC OXIDATION APPLIED TO AZ91D ALLOY. J Chin Soc Corr Pro, 2003, 23(5): 286-289 .

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https://www.jcscp.org/EN/     OR     https://www.jcscp.org/EN/Y2003/V23/I5/286

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